Cross-compilation mental model in Embedded C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the target architecture for cross-compilation.

Embedded C

#define TARGET_ARCH [1]

Drag options to blanks, or click blank then click option'

A"arm"

B"x86"

C"host"

D"native"

Attempts:

3 left

💡 Hint

Common Mistakes

Using "host" or "native" which refer to the current machine, not the target.

Choosing the same architecture as the host defeats cross-compilation.

For cross-compilation, the target architecture is usually different from the host. Here, "arm" is a common target architecture for embedded devices.

2fill in blank

medium

Complete the command to invoke the cross-compiler for ARM architecture.

Embedded C

[1]-gcc main.c -o main

Drag options to blanks, or click blank then click option'

Ax86_64-linux-gnu

Bgcc

Carm-linux-gnueabi

Dclang

Attempts:

3 left

💡 Hint

Common Mistakes

Using "gcc" alone compiles for the host architecture, not cross-compiling.

Using "x86_64-linux-gnu" targets x86_64, not ARM.

The prefix "arm-linux-gnueabi" is commonly used for ARM cross-compilers targeting Linux with the EABI standard.

3fill in blank

hard

Fix the error in the Makefile line to set the cross-compiler prefix.

Embedded C

CROSS_COMPILE = [1]

Drag options to blanks, or click blank then click option'

Aarm-linux-gnueabi

Barm-linux-gnueabi-gcc

Cgcc

Darm-linux-gnueabi-

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the dash causes command errors.

Using the full compiler name instead of the prefix.

The CROSS_COMPILE variable should include the trailing dash to prefix compiler commands correctly, e.g., "arm-linux-gnueabi-gcc".

4fill in blank

hard

Fill both blanks to create a dictionary mapping architectures to their cross-compiler prefixes.

Embedded C

const char* cross_prefixes[] = { [1], [2] };

Drag options to blanks, or click blank then click option'

A"arm-linux-gnueabi-"

B"mips-linux-gnu-"

C"gcc"

D"clang"

Attempts:

3 left

💡 Hint

Common Mistakes

Using compiler names instead of prefixes.

Omitting the dash at the end of prefixes.

Each architecture has a specific cross-compiler prefix ending with a dash to be used in build commands.

5fill in blank

hard

Fill all three blanks to complete the cross-compilation command with architecture, source file, and output name.

Embedded C

[1]-gcc [2] -o [3]

Drag options to blanks, or click blank then click option'

Aarm-linux-gnueabi

Bmain.c

Cmain

Dx86_64-linux-gnu

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing host and target prefixes.

Swapping source and output file names.

The command uses the ARM cross-compiler prefix, compiles the source file main.c, and outputs the executable named main.